Error: dns: bad rdata

I’m trying to deploy my first app (Python) to fly.io.

I follow the prompts from fly launch but I end up with the following error

WARNING The app is not listening on the expected address and will not be reachable by fly-proxy.
You can fix this by configuring your app to listen on the following addresses:
  - 0.0.0.0:8080
Found these processes inside the machine with open listening sockets:
  PROCESS        | ADDRESSES
-----------------*---------------------------------------
  /.fly/hallpass | [fdaa:2:f5a2:a7b:249:69e8:3d34:2]:22

Creating a second machine to increase service availability
Finished launching new machines
-------
NOTE: The machines for [app] have services with 'auto_stop_machines = true' that will be stopped when idling

-------
Checking DNS configuration for hello-xxxx.dev
Error: dns: bad rdata

Not sure what to do next to troubleshoot and fix this. Any idea?

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